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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39409228947d60e06fd552228bd8645329e61d26a9d8710034be6f03d25c3d57' 
  AND token = 'SsOFxWeUWdXr33qhDNuj+p77GUBfzvo3FtxhibbTdME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}